121420005 has 48 divisors (see below), whose sum is σ = 226258560. Its totient is φ = 54463104.

The previous prime is 121419997. The next prime is 121420007. The reversal of 121420005 is 500024121.

It is not a de Polignac number, because 121420005 - 2³ = 121419997 is a prime.

It is a super-2 number, since 2×121420005² = 29485635228400050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121420007) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1113891 + ... + 1113999.

It is an arithmetic number, because the mean of its divisors is an integer number (4713720).

Almost surely, 2^121420005 is an apocalyptic number.

121420005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121420005 is a deficient number, since it is larger than the sum of its proper divisors (104838555).

121420005 is a wasteful number, since it uses less digits than its factorization.

121420005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 121420005 is about 11019.0745981684. The cubic root of 121420005 is about 495.1803648402.

Adding to 121420005 its reverse (500024121), we get a palindrome (621444126).

The spelling of 121420005 in words is "one hundred twenty-one million, four hundred twenty thousand, five".